The 1971 catalog was the first factory catallog to introduce the 444 Marlin Sporter with 22" barrel and PG stock for the first time; but this catalog also features the "Marlin 444 Rifle" (the 444T) in the original 444 specifications with 24" barrel, straight Monte Carlo combed stock; and for the first time since the 444T was cataloged, that model is depicted with a squared finger lever. Both models also featured blade type front sights and ramp style rear sights for the first time (prior to this year, the 444 always featured a Lyman fold-down rear sight and ramp front sight with hood); and both versions retailed for $145.00. It appears that 1971 was the final year of the 24" version of the early Marlin 444T rifle; but Marlin offered/cataloged both models as they closed out their remaining inventory of the early version Model 444T, and your '72 stamped model mostly likely filledl a late order special request. That said, Marlin serial number stamps are not always consistent with production year; we've seen a number of such examples here, and I pesonally have owned a Model 450MR stamped with a serial number two years prior to the year this model was first cataloged. Bottom line, I see nothing extraordinary with the serial number stamp on your gun, and that fact by itself would certainly add no value to the gun among knowledge Marlin collectors.